Conventionally, the hydroscopic nature of Li-TFSI and low boiling point of t-BP are considered as the primary limitations of hole transport layer (HTL), ultimately affecting the power conversion efficiency (PCE) and long-term stability of perovskite solar cell (PSC). To better stress these problems, a dual functional dopant termed PFPPY is reported. The in-depth operating mechanism of PFPPY with Spiro-OMeTAD, its profound effects on overall photovoltaic performance and device physics are systematically investigated. It is observed PFPPY can simultaneously take place of t-BP and FK209 in conventional HTL. By employing PFPPY as dopant cooperating with Spiro-OMeTAD, a higher PCE of 21.38% is achieved, compared with the reference device based on t-BP and FK209-doped Spiro-OMeTAD (19.69%). More importantly, the unencapsulated PFPPY-doped device shows greatly improved stability, maintaining over 90% of its initial PCE after 600 h in 40-50% RH. These findings provide a new strategy to optimize the HTL composition for efficient and stable PSCs.

通常，Li-TFSI的吸湿性和t-BP的低沸点被认为是空穴传输层（HTL）的主要局限性，最终影响了钙钛矿型太阳能电池的功率转换效率（PCE）和长期稳定性（ （PSC）。为了更好地强调这些问题，报道了一种称为PFPPY的双功能掺杂剂。系统地研究了带有Spiro-OMeTAD的PFPPY的深入运行机理，其对整体光伏性能和器件物理的深刻影响。观察到PFPPY可以同时取代传统HTL中的t-BP和FK209。通过雇用PFPPY由于与Spiro-OMeTAD配合使用的掺杂剂，与基于t-BP和FK209掺杂的Spiro-OMeTAD的参考器件（19.69％）相比，PCE达到21.38％的更高。更重要的是，未封装的PFPPY掺杂的器件显示出大大提高的稳定性，在40-50％RH下600小时后，其初始PCE保持90％以上。这些发现为优化高效和稳定PSC的HTL组成提供了新的策略。